| Autor: |
M, Meco, S, Cirri |
| Rok vydání: |
2010 |
| Předmět: |
|
| Zdroj: |
The Journal of cardiovascular surgery. 51(2) |
| ISSN: |
0021-9509 |
| Popis: |
The main indexes of ventricular function used in clinical practice are strongly influenced by the ventricular load conditions. Tissue Doppler imaging (TDI) has been reported to be a powerful modality that enables assessment of ventricular wall motion with a high temporal and spatial resolution. The study of the systolic movements of the mitral annulus has been proposed as a valid index of myocardial contractility. The aim of this study was to verify if the systolic movements of the mitral annulus by TDI are load-dependent in patients undergoing coronary artery bypass grafting. We evaluated the effect of load changes on systolic (S(M)) and isovolumic (S(IVC)) velocity waves, and on isovolumic acceleration (S(IVA)).Twenty-three patients undergoing coronary artery bypass grafting were evaluate. Load was changed with a rapid infusion of 7 cc/kg of a gelatin solution. The sample volume of TDI was placed at the lateral side of the mitral annulus in the mid-esophageal 4-chamber view.The increase preload resulted in a statistically significant increase of S(M) (8.7+/-1.04 cm/s vs. 9.99+/-0.88 cm/s P=0.01), and a statistically significant increase of S(IVC) (5.65+/-1.95 cm/s vs. 6.75+/-1.53 cm/s P=0.03). S(IVA) does not appear to be changed after the increase of preload (203.45+/-45.69 cm/s(2) vs. 211.41+/-71.28 p=0.81).Only S(IVA) seems to be an independent index of cardiac functionality in cardiac surgery patients and appears to be an optimum index in the clinical evaluation of these patients. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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